* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

ul {
    list-style: none;
}

a {
    text-decoration: none;
    -webkit-tap-highlight-color: transparent;
    /*  点击-高亮-颜色:透明  */
}

.img,
a {
    -webkit-touch-callout: none;
    /*     长按-弹出菜单:没有 */
}

img {
    vertical-align: middle;
    border: 0;
}

.cf1::before,
.cf1::after {
    display: table;
    /* 变成表格 */
    content: '';
    /* 内容为空 必须加的属性 */
}

.cf1::after {
    clear: both;
}

i,
em,
b,
strong {
    font-weight: 400;
    font-style: normal;
}

body,
html {
    -moz-user-select: none;
    /*火狐*/
    -webkit-user-select: none;
    /*webkit浏览器*/
    -ms-user-select: none;
    /*IE10*/
    -khtml-user-select: none;
    /*早期浏览器*/
    user-select: none;
}